help needed with regular expressions urgently

[kyletindle]

i need a regular expression that allows only alphanumeric (A..Z, a..z and 0..9) characters and whitespace (ie space and leading and trailing spaces)

They can be in any length and in any order

any replies and im most grateful

regards

kyle

TIA

[mmetzger]

This pattern should work:

[A-Za-z0-9 ]{,}